81d4a4333a
Add enctype framework and change functions to use the generic values from it rather than the values hard-coded for des. Signed-off-by: Kevin Coffman <kwc@citi.umich.edu> Signed-off-by: Steve Dickson <steved@redhat.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
337 lines
8.6 KiB
C
337 lines
8.6 KiB
C
/*
|
|
* linux/net/sunrpc/gss_krb5_mech.c
|
|
*
|
|
* Copyright (c) 2001-2008 The Regents of the University of Michigan.
|
|
* All rights reserved.
|
|
*
|
|
* Andy Adamson <andros@umich.edu>
|
|
* J. Bruce Fields <bfields@umich.edu>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
|
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
|
|
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sunrpc/auth.h>
|
|
#include <linux/sunrpc/gss_krb5.h>
|
|
#include <linux/sunrpc/xdr.h>
|
|
#include <linux/crypto.h>
|
|
|
|
#ifdef RPC_DEBUG
|
|
# define RPCDBG_FACILITY RPCDBG_AUTH
|
|
#endif
|
|
|
|
static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
|
|
/*
|
|
* DES (All DES enctypes are mapped to the same gss functionality)
|
|
*/
|
|
{
|
|
.etype = ENCTYPE_DES_CBC_RAW,
|
|
.ctype = CKSUMTYPE_RSA_MD5,
|
|
.name = "des-cbc-crc",
|
|
.encrypt_name = "cbc(des)",
|
|
.cksum_name = "md5",
|
|
.encrypt = krb5_encrypt,
|
|
.decrypt = krb5_decrypt,
|
|
.signalg = SGN_ALG_DES_MAC_MD5,
|
|
.sealalg = SEAL_ALG_DES,
|
|
.keybytes = 7,
|
|
.keylength = 8,
|
|
.blocksize = 8,
|
|
.cksumlength = 8,
|
|
},
|
|
};
|
|
|
|
static const int num_supported_enctypes =
|
|
ARRAY_SIZE(supported_gss_krb5_enctypes);
|
|
|
|
static int
|
|
supported_gss_krb5_enctype(int etype)
|
|
{
|
|
int i;
|
|
for (i = 0; i < num_supported_enctypes; i++)
|
|
if (supported_gss_krb5_enctypes[i].etype == etype)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static const struct gss_krb5_enctype *
|
|
get_gss_krb5_enctype(int etype)
|
|
{
|
|
int i;
|
|
for (i = 0; i < num_supported_enctypes; i++)
|
|
if (supported_gss_krb5_enctypes[i].etype == etype)
|
|
return &supported_gss_krb5_enctypes[i];
|
|
return NULL;
|
|
}
|
|
|
|
static const void *
|
|
simple_get_bytes(const void *p, const void *end, void *res, int len)
|
|
{
|
|
const void *q = (const void *)((const char *)p + len);
|
|
if (unlikely(q > end || q < p))
|
|
return ERR_PTR(-EFAULT);
|
|
memcpy(res, p, len);
|
|
return q;
|
|
}
|
|
|
|
static const void *
|
|
simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
|
|
{
|
|
const void *q;
|
|
unsigned int len;
|
|
|
|
p = simple_get_bytes(p, end, &len, sizeof(len));
|
|
if (IS_ERR(p))
|
|
return p;
|
|
q = (const void *)((const char *)p + len);
|
|
if (unlikely(q > end || q < p))
|
|
return ERR_PTR(-EFAULT);
|
|
res->data = kmemdup(p, len, GFP_NOFS);
|
|
if (unlikely(res->data == NULL))
|
|
return ERR_PTR(-ENOMEM);
|
|
res->len = len;
|
|
return q;
|
|
}
|
|
|
|
static inline const void *
|
|
get_key(const void *p, const void *end,
|
|
struct krb5_ctx *ctx, struct crypto_blkcipher **res)
|
|
{
|
|
struct xdr_netobj key;
|
|
int alg;
|
|
|
|
p = simple_get_bytes(p, end, &alg, sizeof(alg));
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
|
|
switch (alg) {
|
|
case ENCTYPE_DES_CBC_CRC:
|
|
case ENCTYPE_DES_CBC_MD4:
|
|
case ENCTYPE_DES_CBC_MD5:
|
|
/* Map all these key types to ENCTYPE_DES_CBC_RAW */
|
|
alg = ENCTYPE_DES_CBC_RAW;
|
|
break;
|
|
}
|
|
|
|
if (!supported_gss_krb5_enctype(alg)) {
|
|
printk(KERN_WARNING "gss_kerberos_mech: unsupported "
|
|
"encryption key algorithm %d\n", alg);
|
|
goto out_err;
|
|
}
|
|
p = simple_get_netobj(p, end, &key);
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
|
|
*res = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
|
|
CRYPTO_ALG_ASYNC);
|
|
if (IS_ERR(*res)) {
|
|
printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
|
|
"crypto algorithm %s\n", ctx->gk5e->encrypt_name);
|
|
*res = NULL;
|
|
goto out_err_free_key;
|
|
}
|
|
if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
|
|
printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
|
|
"crypto algorithm %s\n", ctx->gk5e->encrypt_name);
|
|
goto out_err_free_tfm;
|
|
}
|
|
|
|
kfree(key.data);
|
|
return p;
|
|
|
|
out_err_free_tfm:
|
|
crypto_free_blkcipher(*res);
|
|
out_err_free_key:
|
|
kfree(key.data);
|
|
p = ERR_PTR(-EINVAL);
|
|
out_err:
|
|
return p;
|
|
}
|
|
|
|
static int
|
|
gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
|
|
{
|
|
int tmp;
|
|
|
|
p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
|
|
/* Old format supports only DES! Any other enctype uses new format */
|
|
ctx->enctype = ENCTYPE_DES_CBC_RAW;
|
|
|
|
ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
|
|
if (ctx->gk5e == NULL)
|
|
goto out_err;
|
|
|
|
/* The downcall format was designed before we completely understood
|
|
* the uses of the context fields; so it includes some stuff we
|
|
* just give some minimal sanity-checking, and some we ignore
|
|
* completely (like the next twenty bytes): */
|
|
if (unlikely(p + 20 > end || p + 20 < p))
|
|
goto out_err;
|
|
p += 20;
|
|
p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
if (tmp != SGN_ALG_DES_MAC_MD5) {
|
|
p = ERR_PTR(-ENOSYS);
|
|
goto out_err;
|
|
}
|
|
p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
if (tmp != SEAL_ALG_DES) {
|
|
p = ERR_PTR(-ENOSYS);
|
|
goto out_err;
|
|
}
|
|
p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
p = simple_get_netobj(p, end, &ctx->mech_used);
|
|
if (IS_ERR(p))
|
|
goto out_err;
|
|
p = get_key(p, end, ctx, &ctx->enc);
|
|
if (IS_ERR(p))
|
|
goto out_err_free_mech;
|
|
p = get_key(p, end, ctx, &ctx->seq);
|
|
if (IS_ERR(p))
|
|
goto out_err_free_key1;
|
|
if (p != end) {
|
|
p = ERR_PTR(-EFAULT);
|
|
goto out_err_free_key2;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_err_free_key2:
|
|
crypto_free_blkcipher(ctx->seq);
|
|
out_err_free_key1:
|
|
crypto_free_blkcipher(ctx->enc);
|
|
out_err_free_mech:
|
|
kfree(ctx->mech_used.data);
|
|
out_err:
|
|
return PTR_ERR(p);
|
|
}
|
|
|
|
static int
|
|
gss_import_sec_context_kerberos(const void *p, size_t len,
|
|
struct gss_ctx *ctx_id)
|
|
{
|
|
const void *end = (const void *)((const char *)p + len);
|
|
struct krb5_ctx *ctx;
|
|
int ret;
|
|
|
|
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
|
|
if (ctx == NULL)
|
|
return -ENOMEM;
|
|
|
|
if (len == 85)
|
|
ret = gss_import_v1_context(p, end, ctx);
|
|
else
|
|
ret = -EINVAL;
|
|
|
|
if (ret == 0)
|
|
ctx_id->internal_ctx_id = ctx;
|
|
else
|
|
kfree(ctx);
|
|
|
|
dprintk("RPC: %s: returning %d\n", __func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
gss_delete_sec_context_kerberos(void *internal_ctx) {
|
|
struct krb5_ctx *kctx = internal_ctx;
|
|
|
|
crypto_free_blkcipher(kctx->seq);
|
|
crypto_free_blkcipher(kctx->enc);
|
|
kfree(kctx->mech_used.data);
|
|
kfree(kctx);
|
|
}
|
|
|
|
static const struct gss_api_ops gss_kerberos_ops = {
|
|
.gss_import_sec_context = gss_import_sec_context_kerberos,
|
|
.gss_get_mic = gss_get_mic_kerberos,
|
|
.gss_verify_mic = gss_verify_mic_kerberos,
|
|
.gss_wrap = gss_wrap_kerberos,
|
|
.gss_unwrap = gss_unwrap_kerberos,
|
|
.gss_delete_sec_context = gss_delete_sec_context_kerberos,
|
|
};
|
|
|
|
static struct pf_desc gss_kerberos_pfs[] = {
|
|
[0] = {
|
|
.pseudoflavor = RPC_AUTH_GSS_KRB5,
|
|
.service = RPC_GSS_SVC_NONE,
|
|
.name = "krb5",
|
|
},
|
|
[1] = {
|
|
.pseudoflavor = RPC_AUTH_GSS_KRB5I,
|
|
.service = RPC_GSS_SVC_INTEGRITY,
|
|
.name = "krb5i",
|
|
},
|
|
[2] = {
|
|
.pseudoflavor = RPC_AUTH_GSS_KRB5P,
|
|
.service = RPC_GSS_SVC_PRIVACY,
|
|
.name = "krb5p",
|
|
},
|
|
};
|
|
|
|
static struct gss_api_mech gss_kerberos_mech = {
|
|
.gm_name = "krb5",
|
|
.gm_owner = THIS_MODULE,
|
|
.gm_oid = {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"},
|
|
.gm_ops = &gss_kerberos_ops,
|
|
.gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
|
|
.gm_pfs = gss_kerberos_pfs,
|
|
};
|
|
|
|
static int __init init_kerberos_module(void)
|
|
{
|
|
int status;
|
|
|
|
status = gss_mech_register(&gss_kerberos_mech);
|
|
if (status)
|
|
printk("Failed to register kerberos gss mechanism!\n");
|
|
return status;
|
|
}
|
|
|
|
static void __exit cleanup_kerberos_module(void)
|
|
{
|
|
gss_mech_unregister(&gss_kerberos_mech);
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
module_init(init_kerberos_module);
|
|
module_exit(cleanup_kerberos_module);
|